+'\" t
.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
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-.TH SCALB 3 2016-03-15 "" "Linux Programmer's Manual"
+.TH scalb 3 (date) "Linux man-pages (unreleased)"
.SH NAME
scalb, scalbf, scalbl \- multiply floating-point number
by integral power of radix (OBSOLETE)
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
.SH SYNOPSIS
+.nf
.B #include <math.h>
-.sp
-.BI "double scalb(double " x ", double " exp );
-.br
-.BI "float scalbf(float " x ", float " exp );
-.br
-.BI "long double scalbl(long double " x ", long double " exp );
-.sp
-Link with \fI\-lm\fP.
-.sp
-.in -4n
+.PP
+.BI "[[deprecated]] double scalb(double " x ", double " exp );
+.BI "[[deprecated]] float scalbf(float " x ", float " exp );
+.BI "[[deprecated]] long double scalbl(long double " x ", long double " exp );
+.fi
+.PP
+.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.BR scalb ():
-.RS 4
-_XOPEN_SOURCE\ >=\ 500
-.\" || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
-.br
+.PP
+.BR scalb ():
+.nf
+ _XOPEN_SOURCE >= 500
+.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+ || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+ || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
+.fi
+.PP
.BR scalbf (),
.BR scalbl ():
-.RS 4
-_XOPEN_SOURCE\ >=\ 600
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.RE
-.ad b
+.nf
+ _XOPEN_SOURCE >= 600
+ || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+ || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
+.fi
.SH DESCRIPTION
These functions multiply their first argument
.I x
to the power of
.IR exp ,
that is:
+.PP
.nf
-
x * FLT_RADIX ** exp
.fi
-
+.PP
The definition of
.B FLT_RADIX
can be obtained by including
.\" not in /usr/include but in a gcc lib
.SH RETURN VALUE
On success, these functions return
-.IR x
+.I x
*
.B FLT_RADIX
**
.IR exp .
-
+.PP
If
.I x
or
.I exp
is a NaN, a NaN is returned.
-
+.PP
If
.I x
is positive infinity (negative infinity),
.I exp
is not negative infinity,
positive infinity (negative infinity) is returned.
-
+.PP
If
.I x
is +0 (\-0), and
.I exp
is not positive infinity, +0 (\-0) is returned.
-
+.PP
If
.I x
is zero, and
is positive infinity,
a domain error occurs, and
a NaN is returned.
-
+.PP
If
.I x
is an infinity,
is negative infinity,
a domain error occurs, and
a NaN is returned.
-
+.PP
If the result overflows,
a range error occurs,
and the functions return
.BR HUGE_VALL ,
respectively, with a sign the same as
.IR x .
-
+.PP
If the result underflows,
a range error occurs,
and the functions return zero, with a sign the same as
Domain error: \fIx\fP is 0, and \fIexp\fP is positive infinity, \
or \fIx\fP is positive infinity and \fIexp\fP is negative infinity \
and the other argument is not a NaN
-.\" .I errno
-.\" is set to
-.\" .BR EDOM .
+.I errno
+is set to
+.BR EDOM .
An invalid floating-point exception
.RB ( FE_INVALID )
is raised.
.TP
Range error, overflow
-.\" .I errno
-.\" is set to
-.\" .BR ERANGE .
+.I errno
+is set to
+.BR ERANGE .
An overflow floating-point exception
.RB ( FE_OVERFLOW )
is raised.
.TP
Range error, underflow
-.\" .I errno
-.\" is set to
-.\" .BR ERANGE .
+.I errno
+is set to
+.BR ERANGE .
An underflow floating-point exception
.RB ( FE_UNDERFLOW )
is raised.
-.PP
-These functions do not set
-.IR errno .
-.\" FIXME . Is it intentional that these functions do not set errno?
-.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6803
-.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6804
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
-lbw28 lb lb
+lbx lb lb
l l l.
Interface Attribute Value
T{
+.na
+.nh
.BR scalb (),
.BR scalbf (),
.BR scalbl ()
T} Thread safety MT-Safe
.TE
-.SH CONFORMING TO
+.sp 1
+.SH STANDARDS
+None.
+.SH HISTORY
+.TP
.BR scalb ()
-is specified in POSIX.1-2001, but marked obsolescent.
-POSIX.1-2008 removes the specification of
-.BR scalb (),
+4.3BSD.
+Obsolescent in POSIX.1-2001;
+Removed in POSIX.1-2008,
recommending the use of
.BR scalbln (3),
.BR scalblnf (3),
or
.BR scalblnl (3)
instead.
-The
-.BR scalb ()
-function is from 4.3BSD.
-
-.BR scalbf ()
-and
-.BR scalbl ()
-are unstandardized;
-.BR scalbf ()
-is nevertheless present on several other systems
.\" Looking at header files: scalbf() is present on the
.\" BSDs, Tru64, HP-UX 11, Irix 6.5; scalbl() is on HP-UX 11 and Tru64.
+.SH BUGS
+Before glibc 2.20,
+.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6803
+.\" https://www.sourceware.org/bugzilla/show_bug.cgi?id=6804
+these functions did not set
+.I errno
+for domain and range errors.
.SH SEE ALSO
.BR ldexp (3),
.BR scalbln (3)
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